How to import in Google Calendar

I have a well running feed with calendar data from our B&B. Now I am trying to imnport this into a Google Calendar - and fail. The reason is the fille selector only allows me to select local files, not internet files (my ics is at: http://www.slapeninyerseke.nl/KalFeedVoc.ics ). Of course I can save this file to my desktop, but first I want to find out what is wrong here.

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Click the down-arrow next to Other calendars
Select Add by URL from the menu
Find the address of the Google Calendar in iCalendar format, or if you have the iCalendar address of a calendar from a different application (for example, Apple's iCal), you can use this as well.
Enter the address in the field provided
Click the Add Calendar button. The calendar will appear in the Other Calendars section of the calendar list to the left.